/**
 * Copyright (C) 2015 The Gravitee team (http://gravitee.io)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package io.gravitee.am.gateway.handler.oauth2.resources.handler.authorization;

import io.gravitee.am.gateway.handler.common.utils.ConstantKeys;
import io.vertx.core.Handler;
import io.vertx.reactivex.ext.web.RoutingContext;
import io.vertx.reactivex.ext.web.Session;

/**
 * This handler is responsible to initialize the authorization transaction id when it begin.
 * It basically uses the request transaction id and put it in the current session if not already present.
 * This allows to keep the same transaction identifier during all the authorization steps until the last one as been achieved (or fails).
 *
 * @author Jeoffrey HAEYAERT (jeoffrey.haeyaert at graviteesource.com)
 * @author GraviteeSource Team
 */
public class AuthorizationRequestTransactionHandler implements Handler<RoutingContext> {

    private final String transactionIdHeaderName;

    public AuthorizationRequestTransactionHandler(String transactionIdHeaderName) {
        this.transactionIdHeaderName = transactionIdHeaderName;
    }

    @Override
    public void handle(RoutingContext routingContext) {
        final Session session = routingContext.session();

        if(session.get(ConstantKeys.TRANSACTION_ID_KEY) == null) {
            final String tid = routingContext.request().headers().get(transactionIdHeaderName);
            if(tid != null) {
                session.put(ConstantKeys.TRANSACTION_ID_KEY, tid);
            }
        }

        routingContext.next();
    }
}
